CNRFC - Hydrology - Observed River/Reservoir Conditions

RUSSIAN RIVER - HOPLAND (HOPC1)

Latitude: 39.03º N	Longitude: 123.13º W	Elevation: 498 Feet
Location: Mendocino County in California		River Group: Russian Napa

Monitor Stage: N/A

Flood Stage: 15.0 Feet

Observed Data Credit
	Raw streamflow data is provided by the US Geological Survey (USGS). View USGS Data for this station location.

Historical Stage/Flow Data
Note: Water Year 2025 is currently showing peak daily mean values. These will be updated to instantaneous peaks in the coming months.
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2025*	9,710	17.11	Dec 14, 2024
2024*	11,400	18.32	Feb 5, 2024
2023*	11,800	18.64	Dec 31, 2022
2022*	10,200	16.65	Oct 24, 2021
2021*	948	4.36	Feb 2, 2021
Historical High Stage/Flow Events (Period of Record - Oct 1939 to Present) - Ranked by Flow
1956	45,000	27.00	Dec 22, 1955
1965*	41,500	26.01	Dec 22, 1964
1974*	39,700	25.50	Jan 16, 1974
2006*	35,600	26.81	Dec 31, 2005
1940	34,100	24.90	Feb 28, 1940
1943	34,000	26.12	Jan 21, 1943
* Discharge affected by regulation or diversion

Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Official 7 Day National Weather Service Forecast (CAZ113)

Today: Partly cloudy. Patchy valley fog in the morning. Highs 60 to 70.

Tonight: Partly cloudy. Patchy valley fog overnight. Lows 41 to 51.

Sunday: Mostly cloudy. Patchy valley fog in the morning. Slight chance of rain showers in the morning, then rain showers likely in the afternoon. Highs 55 to 65.

Sunday Night: Mostly cloudy. Slight chance of rain showers. Lows 39 to 49.

Monday: Mostly cloudy. Highs 54 to 64.

Monday Night and Tuesday: Mostly cloudy. Chance of rain showers. Lows 37 to 47. Highs 49 to 64.

Tuesday Night: Mostly cloudy. Patchy valley fog. Chance of rain showers. Lows 34 to 44.

Wednesday: Mostly cloudy in the morning then becoming partly cloudy. Chance of rain showers. Highs 51 to 61.

Wednesday Night: Partly cloudy. Patchy valley fog. Slight chance of rain showers. Lows 33 to 43.

Thursday and Thursday Night: Partly cloudy. Highs 55 to 65. Lows 35 to 45.

Friday: Mostly cloudy. Chance of rain showers. Highs 51 to 61.

Flood Impacts
30.0 Feet	Disastrous flooding. Many homes and businesses damaged. Numerous primary and secondary roads and some bridges could be washed out. This is equal to the highest known stage, which occurred in December 1937. 6500 acres were inundated by flood waters.
28.0 Feet	Disastrous flooding will occur. Many homes and businesses could be damaged. Many primary and secondary roads and some bridges could be washed out.
27.0 Feet	Widespread major flooding. At the forecast level, over 500 homes and farm buildings were damaged on December 22, 1955. 6300 acres of land were inundated by flood waters. All persons in the areas area urged to move to high ground and take appropriate action to protect life and property.
26.0 Feet	Widespread major flooding will occur. Primary roads and some bridges will flood.
25.0 Feet	Severe bank erosion is likely with widespread flooding of farmland, buildings, and low-lying homes in the Hopland, Ukiah, and Talmage areas. Many secondary roads will be flooded. This level of flooding caused 6100 acres to flood in February 1940.
24.0 Feet	Flooding of low-lying stuctures and farmland in the Hopland, Ukiah, and Talmage ares. Many secondary roads may also be flooded. Severe bank erosion is possible.
23.0 Feet	Flooding of farmland, buildings, and low-lying homes in the Hopland area. Flooding will begin in the Ukiah and Talmage areas.
21.0 Feet	Flooding of low-lying structures just west of the railroad tracks near Hopland.
20.0 Feet	Flooding of low-lying structures east of the railroad tracks near Hopland.
18.0 Feet	Flooding of Highway 222 near Ukiah. Secondary roads in low-lying areas will be flooded in the Hopland, Ukiah, and Talmage areas.
17.0 Feet	Significant flooding of Highway 175 at the approaches to the Russian River bridge. Minor flooding of Highway 222 near Ukiah, and in crop land along the left and right banks of the Russian River near Hopland.
15.0 Feet	Flooding of Highway 175 is expected at the approaches to the Russian River bridge. Expect flooding of cropland on the right bank of river.

Product Disclaimer

This river graphic is not intended to serve as a substitute for official flood watches, warnings, advisories, or statements issued by the NWS Eureka Weather Forecast Office. Observations are preliminary and subject to change. River levels identified as "forecast" should be consistent with those contained in official NWS products. River levels identified as "guidance" have significant uncertainty due to future weather or reservoir regulation and are provided for planning purposes only.

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